class_docstr: A query that matches per-document values stored in a column rather than
  terms in the inverted index.
  
  This may be useful in special circumstances, but note that this is MUCH
  SLOWER than searching an indexed field.
class_docstr_tok: ["A","query","that","matches","per-document","values","stored","in","a","column","rather","than","terms","in","the","inverted","index",".","This","may","be","useful","in","special","circumstances",",","but","note","that","this","is","MUCH","SLOWER","than","searching","an","indexed","field","."]
code: def is_leaf(self):
      return True
  
file_path: whoosh/src/whoosh/query/qcolumns.py
imports: from whoosh.matching import ConstantScoreMatcher, NullMatcher, ReadTooFar
  from whoosh.query import Query
label_desc: Use image node_id 2 for calling the ColumnQuery obj's underlying member method code with example usage: obj.is_leaf() and returns: True